<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>页面未找到 - 404错误</title>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Poppins', sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #333;
            overflow: hidden;
        }
        
        .container {
            text-align: center;
            padding: 2rem;
            background-color: rgba(255, 255, 255, 0.9);
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            max-width: 600px;
            width: 90%;
            position: relative;
            z-index: 1;
            animation: fadeIn 0.8s ease-out;
        }
        
        h1 {
            font-size: 8rem;
            margin-bottom: 1rem;
            color: #4a6bff;
            text-shadow: 3px 3px 0 rgba(74, 107, 255, 0.1);
        }
        
        h2 {
            font-size: 2rem;
            margin-bottom: 1.5rem;
            color: #444;
        }
        
        p {
            font-size: 1.1rem;
            margin-bottom: 2rem;
            line-height: 1.6;
            color: #666;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: #4a6bff;
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(74, 107, 255, 0.3);
        }
        
        .btn:hover {
            background: #3a5bef;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(74, 107, 255, 0.4);
        }
        
        .animation {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: 0;
        }
        
        .circle {
            position: absolute;
            border-radius: 50%;
            background: rgba(74, 107, 255, 0.1);
            animation: float 6s infinite ease-in-out;
        }
        
        .circle:nth-child(1) {
            width: 150px;
            height: 150px;
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }
        
        .circle:nth-child(2) {
            width: 200px;
            height: 200px;
            top: 60%;
            left: 70%;
            animation-delay: 1s;
        }
        
        .circle:nth-child(3) {
            width: 100px;
            height: 100px;
            top: 80%;
            left: 20%;
            animation-delay: 2s;
        }
        
        .circle:nth-child(4) {
            width: 180px;
            height: 180px;
            top: 30%;
            left: 75%;
            animation-delay: 3s;
        }
        
        @keyframes float {
            0%, 100% {
                transform: translateY(0) rotate(0deg);
            }
            50% {
                transform: translateY(-20px) rotate(5deg);
            }
        }
        
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 6rem;
            }
            
            h2 {
                font-size: 1.5rem;
            }
            
            p {
                font-size: 1rem;
            }
        }
    </style>
</head>
<body>
    <div class="animation">
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
    </div>
    
    <div class="container">
        <h1>404</h1>
        <h2>哎呀，页面走丢了！</h2>
        <p>您访问的页面可能已被移除、重命名或暂时不可用。请检查URL是否正确，或点击下面的按钮返回主页。</p>
        <a href="./index.html" class="btn">返回首页</a>
    </div>
</body>
</html>